Downpipes - HIGHLY recommended.
#14
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100 cell cats desigend for Porchse twin turbo upgrades vs. stock type 400 cell cats. Better flow = more power. The only difference between non EVO downpipes and the stock ones are the pre-cats removed from the turbos.
#15
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...read the info on EVO's site (in the product catalog) about their DP's and compare that to what AWE says about theirs.<ul><li><a href="http://www.evoms.com">EVO Motorsports</a></li></ul>